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You should probably not be following one in the first place.
Following distance is the space between your vehicle and the vehicle in front of you while driving. Maintaining a safe following distance allows you more time to react to sudden stops or changes in traffic situations, helping to prevent rear-end collisions. The general rule is to keep at least a 3-second distance in good weather conditions, and more in adverse conditions.
Vehicle Identification Number - The unique Vehicle Identification Number that is assigned to each vehicle. Think of it as a Social Security Number for transportation. It contains numbers and letters that are particular to a vehicle and only that vehicle.
Rule of thumb, 1 car length every 10 mph
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The chassis contains all the components of the vehicle - it is, in essence, the skeleton/frame of the vehicle to which the engine, transmission, suspension and body are connected.
3 seconds
Medical Evaluation
When following a vehicle in front of you.
Tailgating
At minimum 3 seconds. If the road conditions are adverse, it should be 5 seconds or more.
The standard rule of thumb is that there should be about three car lengths between cars on the road when traffic is flowing.